Question 93Safety & Environmental - QMED

70% to pass

What should you do when the alarm bell on a self-contained breathing apparatus sounds?

AImmediately evacuate the contaminated area.
BOpen the bypass valve on the regulator and immediately evacuate the contaminated area.
CMove the tank selector lever to the full tank position and reset the alarm so you can evacuate the area when it sounds again.
DMove the reserve lever to the 'reserve' position on the regulator and reset the alarm so you can evacuate the area when it sounds again.
AI Explanation

The correct answer is A) Immediately evacuate the contaminated area. When the alarm bell on a self-contained breathing apparatus (SCBA) sounds, it indicates that the air supply in the SCBA tank is running low. This is a critical situation, as the user no longer has a reliable source of breathable air. The proper response is to immediately evacuate the contaminated area to a safe location with clean air. The other options are incorrect because they involve attempting to reset or adjust the SCBA, which could be dangerous and delay the necessary evacuation. The user should not try to open the bypass valve, switch the tank selector, or move the reserve lever, as these actions could further deplete the limited air supply and jeopardize the user's safety.

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Official Resources
46 CFR Safety Equipment USCG Environmental Standards USCG National Maritime Center
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